I think the description and test suite on this problem is slightly off. When I see 'union' I already assume that no duplicates are permitted and order is irrelevant.
Maximum running product for a string of numbers
Distance walked 3D
Convert a numerical matrix into a cell array of strings
Test if two numbers have the same digits
Alternately upper-lower case
Sum of odd numbers in a matrix
index of n^2 in magic(n)
interesting center of magic matrix
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